I don't play, but...cache difficulty would only apply to the first time a cache is found. If you score laker points based on cache difficulty someone grabbing or dropping a laker at a cache they had previously found would get more points unfairly.

Spinowner touched on something I would like to see implemented but have no idea how it could be done: zero (or at least reduced) points for lakers you pick up from a cache previously visited._________________"Hi, I'm Moe, or as the women know me - Hey! You in the bushes."
-Moe, The Simpsons

Another interesting point scheme would be to start all lakers with "one" point and let the point values accrue as they sit in one spot.
The longer they sit ....the more desirable they become_________________So many caches...So little time

Then there is no motivation to move them until the last day of the round. You would be better off with the opposite of that... The shorter the time they stay in a cache the more they are worth._________________Sad state of affairs.